
    *{padding:0;margin:0}
    html,body {
        height: 100%;
        background-color: #000;
    }

    .total{
        width:300px;
        height:50px;
        border:solid grey 5px;
        position:absolute;
        top:0;
        left:0;
        z-index:2;
    }
    .total .num {
    position: absolute;
    top: 0;
    left: 0;
    height: 50px;
    background-color: red;
}